DNA is a long molecule that gives information to an organism in order to survive, develope, and reproduce. It exists in almost all living things. DNA is made up of a sugar-phosphate backbone and molecules that are called bases. It is basically an instruction manual to make up who you are. Each base corresponds with another base as a pair. Thymine and adenine are a pair and cytosine and guanine are a pair. Each of them pair up to make a particular sequence called a gene. Another component that DNA can do is duplicate. So the two strands can unzip so that a new copy can reattach and be made. DNA is what makes you!